Circumstellar disks around Herbig Be stars
T. Alonso-Albi, A. Fuente, R. Bachiller, R. Neri, P. Planesas, L., Testi, O. Berne, C. Joblin

TL;DR
This study investigates circumstellar disks around Herbig Be stars using radio interferometry and SED modeling, revealing smaller, less massive disks compared to lower-mass stars, likely due to UV-driven photoevaporation.
Contribution
It provides new high-resolution observations and a comprehensive statistical analysis of disks around Herbig Be stars, highlighting their smaller sizes and masses relative to lower-mass young stars.
Findings
Disks around Herbig Be stars are generally less massive than those around T Tauri and Herbig Ae stars.
Disk sizes in Herbig Be stars vary, with some comparable to lower-mass stars, others significantly smaller.
Photoevaporation by UV radiation likely causes the rapid dispersal of disks in Herbig Be stars.
Abstract
We completed a search for circumstellar disks around Herbig Be stars using the NRAO Very Large Array (VLA) and the IRAM Plateau de Bure (PdB) interferometers. We present our new VLA and PdBI data for the three objects MWC 297, Z CMa, and LKHa 215. We constructed the SED from near-IR to centimeter wavelengths by adding our millimeter and centimeter data to the available data at other wavelengths, mainly Spitzer images. The entire SED was fitted using a disk+envelope model. In addition, we compiled all the disk millimeter observations in the literature and completed a statistical analysis of all the data. We show that the disk mass is usually only a small percentage (less than 10%) of the mass of the entire envelope in HBe stars. For the disks, there are large source-to-source variations. Two disks in our sample, R Mon and Z CMa, have similar sizes and masses to those found in T Tauri and…
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